Unidentified sources close to Zac say he may have relapsed. “Zac’s friends are worried sick that he’s back into drugs,” SplashNews reports, pointing to a TMZarticle making the same claim despite Zac’s explanation that he was just visiting a local sushi place.

“Zac’s a loner,” one “friend” tells TMZ. “He goes out rarely and the idea of him driving for miles to go to some sushi restaurant in downtown L.A. after midnight is preposterous.”

We’ll admit we’ve also wondered about Zac’s motives for being in notoriously seedy L.A. neighborhood Skid Row even with his sushi excuse. (And believe us, we know that line in the video above — “his friends aren’t California rolling with it” — deserves a grimace.)

As for the bodyguard who was supposedly on scene with Zac, TMZ confirms the guy’s got a record for drugs and violence. Even more interesting, the source says Zac never went to rehab in the first place — just to “a friend’s house outside California and received private therapy.”

What do you make of all this? No need to worry or every reason to fret?